I take my experience from artistic portraiture background.
First, I backup all files from the CF cards and archive with no intent to return to them. Then, I make my own judgment on deleting the duplicates or imperfect photos - it simplifies the later selection process for all of us. About 30% go. In yet-to-happen case they remember something that I did not present to them as proofs (i.e., among those 30%), I'd go to the archive.
Then, I go through the remaining and rate them. Run automatic color and exposure correction on all of them - they become raw files (this is how I call them for the clients), implying very basic post-processing, prone to imperfections. I have no problems showing those because they have seen my finished works made in the past and know what they may become. I do take one sure photo and apply advanced post-processing, showcasing my manual color correction, retouching, and artistic effects. It serves as a personal example of "before and after".
I then present all the files to the clients, recommend about 50 of them (ranked highest), suitable for an album, show an example of my manual PP'ing on a single photo, and let them select those that they want to have carefully processed. I also suggest identifying 10 all-star photos to which I will apply my best knowledge and skill (samples). Those take 5-10 hours each and such an effort definitely cannot be expected on every photo of hundreds given...
Again, this is taken from my artistic portraiture approach. I know it wouldn't appeal to all customers but then, I don't have to get all the clients out there, either.